Forging device for molten metal

ABSTRACT

A forging device for molten metal includes first and second die bodies that are linked by first and second power arms to move back and forth in a cavity of a die base so as to open and close a workpiece shaping space defined between first and second die faces of the first and second die bodies. When the workpiece shaping space is opened, a molten metal is poured, and then the workpiece shaping space is closed to cast a semi-finished workpiece. After that, the first and second power arms axially press and forge the semi-finished workpiece in the workpiece shaping space into a high-strength workpiece. The high-strength workpiece is shaped by casting and forging in the same process.

FIELD OF THE INVENTION

The present invention relates to a forging device for molten metal, and more particularly to a forging device that can produce a high-strength workpiece by casting and forging in the same process.

BACKGROUND OF THE INVENTION

A conventional high-strength workpiece is first manufactured by casting to form a semi-finished product, and then the semi-finished product is pressurized by forging to form a workpiece with high strength. However, the semi-finished product before forging is usually placed in a forging die by manpower, robotic arm or automatic feeding equipment, which needs to be aligned or calibrated. Then, the semi-finished product is forged by a forging machine. The above two processes cost a lot of equipment, labor and time, and the precision of the finished product is poor (there will be a misalignment of the parting line), resulting in poor economic benefits of the above-mentioned conventional processes. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a forging device for molten metal, comprising a die base. The die base has a cavity therein. A first die body and a second die body are disposed in the cavity. One end of the first die body has a first die face. Another end of the first die body is locked by a screw to a first power arm. One end of the second die body has a second die face opposite to the first die face. Another end of the second die body is locked by a screw to a second power arm. A workpiece shaping space is defined between the first die face and the second die face.

The first and second die bodies are linked by the first and second power arms to move back and forth in the cavity of the die base, so as to open and close the workpiece shaping space. When the workpiece shaping space is opened, a molten metal is poured, and then the workpiece shaping space is closed to cast a semi-finished workpiece; after that, the first and second power arms axially press and forge the semi-finished workpiece in the workpiece shaping space into a high-strength workpiece. The high-strength workpiece is shaped by casting and forging in the same process. The workpiece not only has the characteristics of high precision and high strength, but also improves the processing efficiency and reduces the labor cost.

Preferably, the die base is provided with at least one cooling hole communicating with the outside. A cooling liquid is injected into the cooling hole to conduct heat of the die base to the outside.

Preferably, a die-closing groove is disposed in the cavity of the die base, and the die-closing groove is configured to limit ultimate actuation positions of the first die body and the second die body to position the parting lines of the first and second die bodies, so as to obtain a consistent die-closing position.

Preferably, an outer periphery of the workpiece shaping space is formed with an overflow groove. The overflow groove is configured to receive the excess molten metal that is extruded out by casting and forging, so that the high-strength workpiece is produced by casting and forging. The periphery of the high-strength workpiece has a saturated density, and then the excess flash is cut and smoothed by post-processing to achieve high saturation and high quality of the workpiece.

Preferably, each of the first and second power arms is a hydraulic push rod or a screw rod driven by a hydraulic cylinder.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view showing the first action of the present invention;

FIG. 2 is a cross-sectional view showing the second action of the present invention;

FIG. 3 is a cross-sectional view showing the third action of the present invention;

FIG. 4 is a cross-sectional view showing the fourth action of the present invention;

FIG. 5 is a cross-sectional view showing the fifth action of the present invention;

FIG. 5A is a partial enlarged view of FIG. 5;

FIG. 6 is a cross-sectional view showing the sixth action of the present invention;

FIG. 6A is a partial enlarged view of FIG. 6;

FIG. 7 is a cross-sectional view showing the seventh action of the present invention;

FIG. 8 is a cross-sectional view showing the eighth action of the present invention; and

FIG. 9 is a schematic view of a workpiece after casting and forging manufactured by the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.

Referring to FIG. 1 to FIG. 8, the present invention discloses a forging device for molten metal, comprising a die base 10. The die base 10 has a cavity 11 therein. A first die body 20 and a second die body 30 are sequentially disposed in the cavity 11.

One end of the first die body 20 has a first die face 21. (It can be changed according to actual needs). Another end of the first die body 20 is locked by a screw to a first power arm 22. (The first power arm 22 is a hydraulic push rod or a screw rod driven by a hydraulic cylinder.)

One end of the second die body 30 has a second die face 31 opposite to the first die face 21. (According to actual needs, it can be modified relative to the first die face 21). Another end of the second die body 30 is locked by a screw to a second power arm 32. (The second power arm 32 is a hydraulic push rod or a screw rod driven by a hydraulic cylinder.)

A workpiece shaping space 40 for shaping a workpiece is defined between the first die face 21 and the second die face 31.

In detail, first, the first power arm 22 drives the first die body 20 away from the cavity 11. The second power arm 32 drives the second die body 30 to be displaced a distance toward the second power arm 32. A molten metal is poured on the second die face 31, and then the first and second die bodies 20, 30 are closed toward the cavity 11 to cast a semi-finished workpiece. After that, the first and second power arms 22, 32 axially press and forge the semi-finished workpiece in the workpiece shaping space 40, so as to obtain a high-strength workpiece 50 after forging.

The die base 10 is provided with at least one cooling hole 12 communicating with the outside. A cooling liquid 121 (water or coolant) is injected into the cooling hole 12 to conduct heat of the die base 10 to the outside.

Preferably, a stepped die-closing groove 111 is disposed in the cavity 11 of the die base 10. The die-closing groove 111 is configured to limit the ultimate actuation positions of the first die body 20 and the second die body 30 to position the parting lines of the first and second die bodies 20, 30, so as to obtain a consistent die-closing position.

Finally, an outer periphery of the workpiece shaping space 40 is formed with an overflow groove 41. The overflow groove 1 is configured to receive the excess molten metal that is extruded out by casting and forging, so that the high-strength workpiece 50 is produced by casting and forging. The periphery of the high-strength workpiece 50 has a saturated density, and then the excess flash is cut and smoothed by post-processing to achieve high saturation and high quality of the workpiece.

Therefore, through the present invention, the high-strength workpiece 50 is shaped by casting and forging in the same process. The workpiece not only has the characteristics of high precision and high strength, but also improves the processing efficiency and reduces the labor cost.

Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims. 

What is claimed is:
 1. A forging device for molten metal, comprising a die base, the die base having a cavity therein, a first die body and a second die body being disposed in the cavity; one end of the first die body having a first die face, another end of the first die body being locked by a screw to a first power arm; one end of the second die body having a second die face opposite to the first die face, another end of the second die body being locked by a screw to a second power arm; a workpiece shaping space being defined between the first die face and the second die face; wherein the workpiece shaping space is opened and closed through reciprocating movement of the first and second power arms, when the workpiece shaping space is opened, a molten metal is poured, and then the workpiece shaping space is closed to cast a semi-finished workpiece; after that, the first and second power arms axially press and forge the semi-finished workpiece in the workpiece shaping space into a high-strength workpiece.
 2. The forging device as claimed in claim 1, wherein the die base is provided with at least one cooling hole communicating with the outside.
 3. The forging device as claimed in claim 1, wherein a die-closing groove is disposed in the cavity of the die base, and the die-closing groove is configured to limit ultimate actuation positions of the first die body and the second die body.
 4. The forging device as claimed in claim 1, wherein an outer periphery of the workpiece shaping space is formed with an overflow groove.
 5. The forging device as claimed in claim 1, wherein each of the first and second power arms is a hydraulic push rod or a screw rod driven by a hydraulic cylinder. 